Centrifugal fan



FIG. 1 is a front perspective view of a centrifugal fan;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a rear perspective view thereof.

The broken lines in the drawing disclosure depict interior parts of the centrifugal fan that form no part of the claimed design. 

CLAIM The ornamental design for a centrifugal fan, as shown and described. 